Traits > Original : Symptoms
Symptoms
Most Symptoms are the same for every plague. Here is the list of Symptoms and what each one does:
Tier 1 Symptoms
Tier 1 Symptoms are the Symptoms that are available to you right at the start of the game without using any DNA points.
Tier 2 Symptoms
Tier 2 Symptoms are the Symptoms that are available to you after buying one Symptom in that Symptoms type.
Tier 3 Symptoms
Tier 3 Symptoms are the Symptoms that are available to you after buying two Symptoms that have the same infection type.
Tier 4 Symptoms
Tier 4 Symptoms are the Symptoms that are available to you after buying three Symptoms that have the same infection type.
Tier 5 Symptoms
Tier 5 Symptoms are the Symptoms that are available to you after buying Four Symptoms that have the same infection type.